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adder: document caps negotiation raciness and workaround

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https://bugzilla.gnome.org/show_bug.cgi?id=777915
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Tim-Philipp Müller 2017-07-14 13:40:07 +01:00
parent d0199321c2
commit cb5a2dcfbb
1 changed files with 6 additions and 0 deletions
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6
gst/adder/gstadder.c
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@ -34,6 +34,12 @@
* audio mixing element: It will sync input streams correctly and also handle * audio mixing element: It will sync input streams correctly and also handle
* live inputs properly. * live inputs properly.
* *
* Caps negotiation is inherently racy with the adder element. You can set
* the "caps" property property to force adder to operate in a specific audio
* format, sample rate and channel count. In this case you may also need
* audioconvert and/or audioresample elements for each input stream before the
* adder element to make sure the input branch can produce the forced format.
*
* ## Example launch line * ## Example launch line
* |[ * |[
* gst-launch-1.0 audiotestsrc freq=100 ! adder name=mix ! audioconvert ! autoaudiosink audiotestsrc freq=500 ! mix. * gst-launch-1.0 audiotestsrc freq=100 ! adder name=mix ! audioconvert ! autoaudiosink audiotestsrc freq=500 ! mix.